Rock-drill.



. Patented May I5, I900.

N U S W A L .L

ROCK DRILL (Application filed Dec. 23, 1898;)

(No Model.)

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EMANUEL LAWSON, OF BRElVER, MAINE.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 649,464, dated May 15,1900.

Application filed December 23, 1898. Serial No. 700,145. (No model.)

To all whom, it may concern:

Be it known that I, EMANUEL LAWSON, a citizen of the United States ofAmerica, and a resident of Brewer, Penobscot county, State of Maine,have invented certain new and useful Improvements in Rock-Drills, ofwhich the following is a specification.

This invention relates to rock-drills of that class which is operated byhand-power, and has for its object to improve the construction andarrangement of the parts thereof.

In accordance with this invention a frame is provided, and a drill-baris constructed and arranged to work up and down therein, having securedthereto a drill, and mechanism is provided to operate said drillconsisting of a clutch to engage said drill-bar, a device to raise saidclutch and drill-bar held by it, a device for turning said drill as itis raised, means for disengaging said clutch from said drill-bar whensaid drill drops to deliver a blow, a spring to quicken and increase theforce of said blow, a device for advancing said spring as said drill isfed ahead, and means for moving said clutch and clutch-raising deviceinto position to engage and raise said drill-bar while said drill isdelivering a blow.

Figure 1 is a front elevation of a rock-drill embodying this invention.Fig. 2 is a side elevation of the rock-drill shown in Fig. 1, with apart of one leg removed. Fig. 3 is an elevation in section of a part ofthe mechanism for raising the drill to be referred to. Fig. 4 is a sideelevation of a part of the drillbar, showing a ratchet-and-pawl deviceto be referred to; and Fig. 5 is a plan view of the parts shown in Fig.4.

The letter a denotes the frame of the rockdrill, shown in the drawingsas made of angle-iron for strength and lightness, and b the drill-bararranged to work up and down in said frame a between the two legsthereof, having its lower end cut away for a clamp b, which detachablysecures a drill b to said drill-bar Z). Two bearings are provided inwhich said drill-bar b and drill b secured thereto, are adapted to work,one arranged near the lower end of said frame a and the other secured tothe upper end thereof, and said bearing near the lower end of said framea, through which said drill b loosely passes, acts as a guide thereforand is formed in a cross-brace b of said frame a, and a detachable plate11 is provided and secured thereto, so that said drill b may be quicklyremoved when desired and another put in its place. Said bearing at theupperend of the machine is secured to said frame 0, thereof and consistsof a block having journaled therein two antifriction-rollers I)", havinggrooved or concave surfaces between which said drill-bar Z2 works, theobject of said antifriction-rolh ers b being to reduce friction betweensaid drill-bar b and said bearing without the necessity of lubricatingsaid drill-bar b, as would be necessary if a bearing of commonconstruction was employed. The device for raising said drill consists ofa clutch c, constructed and arranged to engage said drill-bar b, andsaid clutch a may be formed of a strap 0, elm bracing said drill-bar band a lever 0 pivoted to said strap 0' and adapted to frictionally engage and clamp said drill-bar b in said strap 0, as shown in Figs. 1 and2. Said lever c is provided with a shank portion 0 adapted to engage arod or guide 0 set at an angle with one leg of said frame a to turn saiddrill b as it is raised, as shown in Figs. 1 and 2. To operate saiddrill N, a main shaft dis provided and arranged to turn in bearingssecured to the legs of said frame a, having mounted thereon wheels d,having handles to rotate said shaft (1 to furnish power, and said wheelsd may be arranged one at each side of said frame a. of the machine, asshown in Fig. 1. A sprocket-wheel a is mounted upon said main shaft 1),carrying a sprocketchain 6 through which power is conveyed from saiddriving-shaft d to a shaft 6, upon which a similar sprocket-wheel e ismounted, over which saidsprocket-chain e passes, and said shaft e islocated in said frame a above said main shaft (Z and turns in bearingssecured to the legs of said frame a. The mechanism for raising saiddrill b and thereafter releasing it when it drops to deliver a blow, aswill be described, consists of a drum 0", free to revolve upon saidshaft 6, having secured thereto one end of a chain or belt 0 adapted tobe wound thereon, the other end of which being secured to said shank eof said lever c of said clutch c, and said drum 0 has formed upon theoutside surface thereof a projection 0 A block 0 is secured to saidshaft 6, having a portion 0 projecting over the circumference of saiddrum 0, through which a pin 0 passes, projecting into the path of saidprojection 0 formed upon said drum 0, so that when said shaft 6 revolvessaid block 0 secured thereto, also turns therewith, moving said pin 0into engagement with said projection 0 formed upon said drum c, whichbeing free to turn revolves with said shaft e, winding upon itself saidbelt or chain 0 which raises said clutch 0, attached to the. other endof said chain 0 and drill-bar d engaged by it. Said clutch c issupported in its normal position by said chain c and held out ofparallel with said shaft e by said guide-rod 0 which engages said shankportion 0 of said clutch c, as shown in Figs. 1 and 2, so that as saidclutch c is raised said shank portion 0? thereof moves along saidguide-rod 0', being held in engagement therewith by said chain 0 asshown in Fig. 2, turning said clutch c and drill-bar engaged by itaxially a part of a revolution as it is raised. To disengage saiddrill-bar b from said clutch o, a tripping-pin f is secured to one legof said frame a and arranged in the path of said clutch 'c as it israised by said belt or chain 0 so that said shank portion 0 of saidclutch 0 will come up against said tripping-pin f just before saidclutch 0 reaches its highest elevation, whereupon further upwardmovement of said shank portion a is arrested, and said lever 0 turningon its pivot, as shown by dotted lines, Fig. 1, releases said drill-barb,wh en it drops to deliver a blow. As said clutch c is disengaged fromsaid drill-bar b the weight thereof reacts upon said clutch c, causingit to spring upwardly, and to hold said clutch c in place and prevent itfrom springing out of position as it releases said drill-bar a stop 0 isprovided, projectin g downwardly from said frame a and occupyin g aposition directly above said clutch c. Tomove said clutch 0 intoposition to engage and raise said drill-bar b after it drops to delivera blow, said pin 0 is disengaged from said projection 0 formed upon saiddrum 0, by means to be described, when the latter being free to revolveupon said shaft 6 the weight of said chain or belt 0 wound upon saiddrum 0 and the weight of said clutch 0 causes it to drop by gravity intoposition to raise said drill. To disengage said pin 0 from saidprojection 0 so that said drum c may revolve to its normal position uponsaid shaft 6, a tripping-arm z'is secured to one leg of said frame a ofthe machine, having mounted thereon an antifriction-roller if, and saidpin 0 is constructed and arranged to pass up through said projectingportion 0 of said block 0 and said pin 0 may have its end bent at rightangles thereto, upon which is mounted an antifriction-roller 0 and astud projecting from said pin 0 is adapted to engage a spiral spring 0located in an aperture in said block c to normally press said pin 0 intoposition to engage said projection 07, formed upon said drum 0. Said pin0 is arranged so that once each revolution of said shaft c said rollermounted upon said pin 0 will engage said roller i, mounted upon saidtripping-arm 2', which raises said pin 0 out of engagement with saidprojection 0 formed upon said drum 0, allowing the latter to revolve toits normal position upon said shaft e. To increase the power of saiddrill b as it drops to deliver a blow, said drill-bar b may be weightedby having a portion n of large diameter, and to quicken the stroke andfurther increase the power of a blow a spiral springf may be em- Iployed, one end of which may be attached to the upper end of saidweighted portion n of said drill-bar b and the other end thereof may besecured to a clutch 0, en gaginga guiderod 0, secured to said frameandarranged substantially parallel with said drill-bar b, and said clutchois adapted to grip said guiderod 0' as said drill-bar b is raisedagainst the action of said spring f, and said clutch 0 is arranged tomove forward upon said rod 0 as said drill b is fed ahead, so that theaction of said spring f will be uniform as said drill advances. Eachtime said drill b is raised said shank portion 0 of said clutch c,engaging said guide-rod 0 turns said clutch c and drill-bar I), held byit, a part of a revolution, so that said drill b will cut a circularhole in the rock to be drilled, and to prevent said drill Z) fromturning back as it drops to deliver a blow or from the jar or shock fromcoming in contact with the rock to be drilled a crown-ratchet 0 isformed around the top of said weighted portion n of said drill-bar b anda pawl 0 secured to a swivel or collar 0 embracing said weighted portionn of said drill-bar b, so that as said drill-bar 1) turns said pawl 0will successively en gage the teeth of said ratchet o and prevent saiddrill b from turning back.

The operation of the drill is as follows: The parts thereof being in theposition taken by them after said drill-bar has dropped to deliver ablow, as shown in Figs. 1 and 2, power is supplied to revolve said mainshaft d, which is communicated through said sprocket-chain e to saidshaft e, which revolves, carrying with it said block a and said pin 0engages said projection 0 formed upon said drum 0, which is revolved,winding thereon said chain or belt 0 which raises said clutch a, securedthereto, and said drill-bar b, engaged by it, against the action of saidspring said shank portion c of said clutch c engaging said guiderod 0which being set at an angle with said frame a turns said clutch caxially as it is raised, turning said drill b and drill-bar b, engagedby it. Just before said clutch 0 reaches its highest elevation fartherupward movement of said shank portion 0 is arrested by coming in contactwith said tripping-pin f, which releases said drill-bar b, when it dropsby gravity and the pull of said spring f to deliver a blow upon the rockto be drilled. As

said drill 12 drops, the upper end of said pin 0 engages saidtripping-arm t, which lifts said pin 0 out of engagement with saidprojection 0 formed upon said drum 0, when the latter revolves bygravity to its normal position upon said shaft e, moving said pin 0 to aposition in front of said pin 0 and said clutch 0 into a position toraise said drill-bar Z),

-and said shaft e continuing to revolve moves said pin 0 into engagementwith said projection c to again raise said drill 6 I claim l 1. In arock-drill, a frame, a drill-bar carrying a drill and adapted to operatein the frame, a clutch adapted to operate the drillbar, a drum, a beltor chain having one end connected with the clutch and the other end withthe drum, said drum adapted to revolve with the shaft to wind the beltor chain thereon and operate the clutch to engage and raise thedrill-bar, and to revolve on the shaft in the reverse direction tounwind the belt or chain and lower the clutch, means for adapting thedrum to revolve on or with its shaft, means for operating the drum, andmeans for releasing the drill-bar from the clutch, substantially asdescribed.

2. In a rock-drill, a frame, a drill-bar carrying a drill and adapted tooperate in the frame, a clutch adapted to operate the drillbar, meansfor operating the clutch consisting of a shaft mounted in the frame, adrum adapted to revolve on or with the shaft and having a projection, anarm or block secured to the shaft and carrying a pin, said pin adaptedto engage the projection on the drum to revolve the drum with the shaft,and to be disengaged from the projection to allow the drum to revolveindependently of the shaft, and means for operating the drum,substantially as described.

3. In a rock-drill, a frame, a drill-bar carrying a drill and adapted tooperate in the frame, a clutch adapted to operate the drillbar, a drum,a belt or chain having one end connected with the clutch and the otherend with the drum, said drum adapted to revolve with the shaft to windthe belt or chain thereon and operate the clutch to engage and raise thedrill-bar, and to revolve on the shaft in the reverse direction tounwind the belt or chain and lower the clutch, means for adapting thedrum to revolve on or with its shaft, means for operating the drum,means for turning the clutch and drill-bar axially, means for preventingthe drill-bar from turning backward as it drops, and means for releasingthe drill-bar from the clutch, substantially as described.

4. In a rock-drill, a frame, a drill-bar carrying a drill and adapted tooperate in the frame, a clutch, means for operating the clutch to engageand raise the drill-bar,means for releasing the drill-bar from theclutch, a guide rod secured to the frame, a clutch adapted to engage theguide-rod and free to move along the same, and a spring adapted toquicken the action of the drill-bar having one end secu red to thedrill-barand the other end to the clutch, substantially as described.

5. In a rook-drill, a frame, a drill-bar carrying a drill and adapted tooperate in the frame, a guide-rod secured to the frame, a clutch adaptedto engage the guide-rod and free to move along the same, a springadapted to quicken the action of the drill-bar having one end secured tothe drill-bar and the other end to the clutch, means for raising thedrill-bar against the action of said spring, and means for releasing thedrill-bar, substantiall y as described.

6. In a rock-drill, a frame, a drill-bar ar ranged to work therein, adrill, a clutch to engage, raise and release said drill-bar, a shaft, adrum free to turn thereon, a projection formed on said drum, a belt orchain connecting said drum with said clutch, a block secured to saidshaft, a pin arranged in said block to engage said projection to revolvesaid drum and means for moving said pin out of engagement with saidprojection,

whereupon said drum revolves, and said clutch supported thereby movesinto position to raise said drill-bar, substantially as de scribed.

7. In a rock-drill, a frame, a drill-bar carrying a drill adapted tooperate in the frame, a clutch, a drum mounted on a shaft in the frameadapted to operate the clutch, means for adapting the drum to revolve onor with its shaft, means for operating the drum, astop to limit theupward movement of the clutch, and means for releasing the drill-barfrom the clutch, substantially as described.

8. In a rock-drill, a frame, a drill-bar carrying a drill and adapted tooperate in the frame, a clutch adapted to operate the drilh bar, meansfor operating the clutch consisting of a shaft mounted in the frame, adrum adapted to revolve on or with the shaft and having a projection, anarm or block secured to the shaft and carrying a pin adapted to worktherein, said pin adapted to engage-the projection on the drum torevolve the drum with the shaft, and to be disengaged from theprojection to allow the drum to revolve independently of the shaft, andmeans for operating the drum, substantially as described.

Signed by me at Bangor, Maine, this 17th day of December, 1898.

EMANUEL LAWSON.

\Vitnesses:

WILLIAM B. PEIROE, HARRY O. ROBINSON.

